Analysis of complex seismicity patterns generated by fluid diffusion and aftershock triggering

According to the well-known Coulomb failure criterion, the variation of both, stress and pore pressure, can result in earthquake rupture. Aftershock sequences characterized by the Omori law are often assumed to be the consequence of mainshock induced stress changes, whereas earthquake swarms are supposed to be triggered by fluuid intrusions. In practice, both types of seismicity are often not clearly distinguishable, which might result from an interplay of stress triggering and fluid diffusion in the earthquake generation process. We show that statistical modeling of earthquake clustering by means of the Epidemic Type Aftershock (ETAS) model and simple pore pressure diffusion models can be an appropriate tool to extract the primary fluid signal from such complex seismicity patterns. This is demonstrated for two examples of natural swarm activity observed in Central Europe.

@inproceedings{id627,
  author = {Hainzl, S. and Kraft, T.},
  booktitle = {4th International Workshop on Statistical Seismology, in memory of Tokuji Utsu, Shonan/Kanagawa, Japan},
  language = {en},
  title = {Analysis of complex seismicity patterns generated by fluid diffusion and aftershock triggering},
  url = {https://www.geophysik.uni-muenchen.de/Members/toni/SSJap06.pdf},
  year = {2006},
}

%O Conference Proceedings
%A Hainzl, S.
%A Kraft, T.
%B 4th International Workshop on Statistical Seismology, in memory of Tokuji Utsu, Shonan/Kanagawa, Japan
%G en
%T Analysis of complex seismicity patterns generated by fluid diffusion and aftershock triggering
%U https://www.geophysik.uni-muenchen.de/Members/toni/SSJap06.pdf
%D 2006